code: def _parent_process_is_running(self):
      if not self.host_is_alive.value:
          return False
      ppid = os.getppid()
      return ppid != 1
  
imports: import grpc
  import os
  import time
  import threading
  from concurrent import futures
  from parl.remote import remote_constants
  from parl.remote.grpc_heartbeat import heartbeat_pb2
  from parl.remote.grpc_heartbeat import heartbeat_pb2_grpc
  from parl.utils import logger, get_ip_address
  import psutil
  import multiprocessing
label_desc: Use image node_id 5 for calling the GrpcHeartbeatServer obj's underlying member method code with example usage: obj._parent_process_is_running() and returns: unknown, False